My impression is that these apps, which you see advertised all over the web, often in non-computer sites, are scams. Among other things, they install browser plug-ins that--guess what--show you more ads.

Or you must purchase them and then they do no more than other legitimate cache-removal software.

My recommendation is to stay away from them.

Many web sites, even some legitimate ones, are festooned with underlined or double underlined words that are all links to ads. Many others feature pop-up or pop-under windows. There really isn't any way to deal with this except to avoid those sites and try to never click on any ad. If you really want to buy something, go direct to the site you want to buy from.

My general impression is that "cleaning up" is a bogus concept. If you are running out of hard drive space (you probably want 25% or more free), and can't install a larger main drive, you should move some user data files to another drive, or archive some. Software that offers to remove unneeded files can't really be relied upon to accurately identify such files.
Sometimes, damaged cache files can cause odd problems, and deleting those files can solve the problem. This is rare, however, and is not necessary as part of maintenance. It is even rarer that a Mac is slow because of cache files.The software Onyx is free and can delete cache files.The software Tinker Tool System (not the same as TinkerTool) is not free, but can do the same.

"Design is not just what it looks like and feels like. Design is how it works."
Steve Jobs

A very common cause of a Mac pausing when you think it shouldn't is that it's waiting for a drive to spin up. If you have any external drive connected all the time--for example a Time Machine drive--it will wake from sleep and spin up at odd times, not just when you are trying to access it. Time Machine, of course, will spin up the drive once an hour. But other apps will do that too, even if they never actually access the drive.

"Design is not just what it looks like and feels like. Design is how it works."
Steve Jobs